[PATCH 2/2] tools/fit_check_sign: make key optional

[Daniel Golle]

On Sat, Mar 29, 2025 at 03:13:01AM +0000, Daniel Golle wrote:
> Allow invoking fit_check_sig without the key parameter, allowing to
> validate only checksums and hashes for unsigned images.

Sadly I've missed making the munmap() of the key_blob conditional as
well, and while glibc seems to be graceful about munmap(NULL) other libc
like musl are not.

I will fix that in v2.